﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Text.RegularExpressions;
using System.IO;
using System.Xml;

namespace JiuMeiMall.PMethod
{
    public class DataConvert
    {
        /// <summary>
        /// List转XML
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="lists"></param>
        /// <returns></returns>
        public static string ListtoXML<T>(List<T> lists)
        {
            //lock (o)
            //{
            if (lists.Count <= 0)
            {
                return "<data></data>";
            }
            StringBuilder xml = new StringBuilder();
            System.Reflection.PropertyInfo[] ts;
            xml.Append("<data>");
            foreach (T t in lists)
            {
                ts = t.GetType().GetProperties();
                xml.Append("<row ");
                for (int i = 0; i < ts.Length; i++)
                {
                    xml.Append(ts[i].Name + "=\"" + ((ts[i].GetValue(t, null) == null) ? "" : (ts[i].GetValue(t, null).ToString().Trim())) + "\" ");
                }
                xml.Append("/>");
            }

            xml.Append("</data>");
            return xml.ToString();
            //}
        }
        /// <summary>   
        /// 根据Json返回DateTable,JSON数据格式如:   
        /// {table:[{column1:1,column2:2,column3:3},{column1:1,column2:2,column3:3}]}   
        /// </summary>   
        /// <param name="strJson">Json字符串</param>   
        /// <returns></returns>   
        public static DataTable JsonToDataTable(string strJson)
        {
            //取出表名   
            var rg = new Regex(@"(?<={)[^:]+(?=:\[)", RegexOptions.IgnoreCase);
            string strName = rg.Match(strJson).Value;
            DataTable tb = null;
            //去除表名   
            strJson = strJson.Substring(strJson.IndexOf("[") + 1);
            strJson = strJson.Substring(0, strJson.IndexOf("]"));

            //获取数据   
            rg = new Regex(@"(?<={)[^}]+(?=})");
            MatchCollection mc = rg.Matches(strJson);
            for (int i = 0; i < mc.Count; i++)
            {
                string strRow = mc[i].Value;
                string[] strRows = strRow.Split(',');

                //创建表   
                if (tb == null)
                {
                    tb = new DataTable();
                    tb.TableName = strName;
                    foreach (string str in strRows)
                    {
                        var dc = new DataColumn();
                        string[] strCell = str.Split(':');
                        dc.ColumnName = strCell[0];
                        tb.Columns.Add(dc);
                    }
                    tb.AcceptChanges();
                }

                //增加内容   
                DataRow dr = tb.NewRow();
                for (int r = 0; r < strRows.Length; r++)
                {
                    dr[r] = strRows[r].Split(':')[1].Trim().Replace("，", ",").Replace("：", ":").Replace("\"", "");
                }
                tb.Rows.Add(dr);
                tb.AcceptChanges();
            }

            return tb;
        }
        /// <summary>
        /// Table转XML
        /// </summary>
        /// <param name="xmlDS"></param>
        /// <returns></returns>
        public static string ConvertDataTableToXML(DataTable xmlDS)
        {
            MemoryStream stream = null;
            XmlTextWriter writer = null;
            try
            {
                stream = new MemoryStream();
                writer = new XmlTextWriter(stream, Encoding.Default);
                xmlDS.WriteXml(writer);
                int count = (int)stream.Length;
                byte[] arr = new byte[count];
                stream.Seek(0, SeekOrigin.Begin);
                stream.Read(arr, 0, count);
                return System.Text.Encoding.Default.GetString(arr).Trim();
            }
            catch
            {
                return String.Empty;
            }
            finally
            {
                if (writer != null) writer.Close();
            }
        }
        /// <summary>
        /// XML转DataSet
        /// </summary>
        /// <param name="xmlData"></param>
        /// <returns></returns>
        public static DataSet ConvertXMLToDataSet(string xmlData)
        {
            StringReader stream = null;
            XmlTextReader reader = null;
            try
            {
                DataSet xmlDS = new DataSet();
                stream = new StringReader(xmlData);
                reader = new XmlTextReader(stream);
                xmlDS.ReadXml(reader);
                return xmlDS;
            }
            catch (Exception ex)
            {
                string strTest = ex.Message;
                return null;
            }
            finally
            {
                if (reader != null)
                    reader.Close();
            }
        }
    }
}
